JP3937613B2 - Stabilizing liquid production plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stable liquid production plant used for ground excavation.
[0002]
[Prior art]
When excavating the ground and excavating the groove for the underground continuous wall, in order to stabilize the groove wall, it is usually necessary to fill the excavation groove with a stable liquid composed of bentonite and water-soluble polymer (CMC) mud. The excavation work is carried out to the depth, and then a continuous wall is constructed by installing a reinforcing bar and placing concrete to replace it with a stable liquid.
[0003]
Since the above-mentioned stabilizing liquid can be produced by mixing and dispersing each material in water, conventionally, there is no special equipment as a production apparatus or a production plant, and generally a general-purpose stirring tank is filled with water, Bentonite and water-soluble polymer material are weighed and added so as to have a predetermined blending ratio with respect to the amount of water, and the inside of the stirring tank is stirred with a kneading mixer to disperse the material in water so that a stable liquid is obtained. ing.
[0004]
[Problems to be solved by the invention]
However, since all the operations described above depended on the manual work of the workers except for the stirring work, there were the following technical problems.
[0005]
First, as the first problem, since each material is a powder, when a large amount of material is added at a time when the material is added to water, a so-called “dama” secondary agglomerated lump is formed. Thus, once a lump is formed, it does not disappear easily even if the stirring time is increased, and it is difficult to obtain a uniformly dispersed stable solution. On the contrary, when the materials are added little by little while stirring the stirring tank, although it is difficult to form a lump, it takes a long time for the production, and the production efficiency is lowered.
[0006]
In addition, since the weighing, transfer and loading operations are performed manually, it takes time to carry the material from the material storage area to the stirring tank, and there is a risk of dust scattering during the loading operation. There was a problem that non-uniform product per batch was likely to occur due to errors.
[0007]
The present invention solves the above-mentioned problems, and an object of the present invention is to provide a stable liquid production plant that can automatically and uniformly mix and disperse each powder material constituting the stable liquid in a short time. Is.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a closed stirring tank and a fresh water tank disposed in the lower floor portion of the frame, and a plurality of powder materials constituting the stabilizing liquid are housed in the upper floor portion. A storage tank is disposed, and a stable liquid production plant is connected to the upper part of the stirring tank via powder transporting means and mixing means connected to the lower discharge port of each storage tank , wherein the mixing means includes the Each jet pipe communicates with the discharge port of each powder conveying means and is arranged on the upper surface of the agitation tank, and the powder material is mixed and dispersed in water by the turbulent flow effect by the jet water flow, and is a jet tube It is characterized by.
[0009]
Therefore, in the present invention, all the devices necessary for the production of the stable liquid are packaged in one place in the frame frame, so that it is compact, and from the introduction of materials stored in a closed system to mixing and dispersion. Since it can be performed, there is no need for manpower to transfer and input the powder material during production, labor can be saved, and there is no problem due to generation of dust.
[0010]
Further, in the present invention, the mixing means is a jet tube for charging the powder material into the stirring tank in a state of being mixed and dispersed in water by the turbulent flow effect of the jet water flow, so that it is charged into the stirring tank Since the above material is already uniformly dispersed in water and does not form secondary agglomerates, the production of a stable liquid can be performed in a short period of time.
[0011]
Furthermore, since each said storage tank and stirring tank are suspended and supported in the frame frame via the load detection means, manufacturing weight and mixing ratio management become easy.
[0012]
Furthermore, in the present invention, load setting means for each powder material constituting the stabilizing liquid, load detection means provided in the stirring tank and the storage tank for storing each powder material, and each powder material directed to the stirring tank. Supply means for supplying powder, stirring means for mixing and dispersing the supplied powder material in water and supplying it into the stirring tank, and supplying fresh water into the stirring tank and supplying fresh water for mixing in the stirring tank And a control means for stopping the supply of each supply means when the value of the load detection means matches the set load by comparing the set load and the output from the load detection means. From production to production can be performed automatically.
[0013]
Furthermore, in the present invention, when each powder material and fresh water are put into the stirring tank, the mixture in the stirring tank is circulated and the pump means for transferring to the stable liquid storage tank side by switching the switching means is provided. By being provided, it is possible to further uniformly mix and disperse each material in the stirring tank and to transfer the manufactured stable liquid as it is, so that there is no waste of function.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIG. 1 is a front view of a stable liquid production plant according to the present invention, FIGS. 2A to 2C are side views of the plant, a plan view of the first floor that is the lower floor, and a second floor that is the upper floor. It is a top view.
[0016]
In the figure, the production plant 1 is a fully automatic batch plant, and all the devices necessary for the production of a stable liquid are collectively contained in a frame frame 2 which is rectangular in a plan view. Packaged structure. The frame frame 2 has, for example, a two-story structure, and the periphery of the roof is surrounded by a handrail 3 for curing, and the floors are connected to each other by a ladder 4 or the like.
[0017]
In the manufacturing plant 1, each device has the following devices and arrangement. First, in the first floor portion, which is the lower floor portion in the frame 2, the closed stirring tank 5 disposed in the center and one side (left side in the figure) sandwiching the stirring tank 5 are disposed, and water is supplied from the outside. Water tank 6 for receiving water and a control panel 7 disposed on the other side (right side in the figure) of the agitation tank 5 and equipped with a sequencer for automatic operation of the plant 1, a microcomputer, a touch panel display, and a terminal board 8 and the like, and a compressor 9 as a switching valve power source.
[0018]
Further, in the second floor portion, which is the upper floor portion in the frame 2, a hopper-like bentonite storage tank 10 arranged on one side thereof and a storage of the same hopper-like polymer (CMC) arranged in parallel on the other side. The tank 11 and the dispersing agent storage tank 12, and three screw conveyors 14, 15, and 16 for transferring powder horizontally disposed with the supply ports connected to the lower discharge ports of the storage tanks 10 to 12 are provided. . In addition, the top part of each storage tank 10,11,12 is connected to the powder transport pipe which is not shown in figure, and when a residual amount becomes small, a material is sequentially supplied through a transport pipe.
[0019]
Each of the storage tanks 10 to 12 and the agitation tank 5 are suspended and supported in the frame frame 2 via a load cell 17 as a load detection means. The load cell 17 is a load sensor for control during plant operation described later. Is functioning as That is, the supply amount of the material in each of the storage tanks 10 to 12 to the stirring tank 5 is detected by the load cell 17 as a decrease from the initial operating weight. Moreover, the addition amount of the material in the stirring tank 5 and fresh water is similarly detected by the load cell as an increase from the initial operating weight.
[0020]
The discharge ports of the screw conveyors 14 to 16 communicate with three jet tubes 18 for stirring and mixing disposed on the upper surface of the stirring tank 5. Each jet pipe 18 jets material powder supplied from the screw conveyors 14 to 16 into the agitation tank 5 by a jet water flow that ejects pressure water from a pump 20 connected to the fresh water tank 6 from a nozzle. Thus, the shape structure shown in FIG. 3 or 4 is obtained.
[0021]
A jet pipe 18 shown in FIG. 3 is a CMC jet pipe, and a cylindrical powder injection pipe 18b formed around an annular flange 18a connected to the discharge ports of the screw conveyors 14 to 16, and an input pipe 18b, a jet water flow suction pipe 18d having a rectangular cross-sectional opening formed integrally therewith at a required angle and having a rectangular flange 18c formed around it; A discharge pipe 18e having a rectangular cross-section opening which is on the side portion side and is coaxially integrated with the suction pipe 18d and having a larger cross-sectional shape than the suction pipe 18d. The powder that is composed of the transparent body and flows inside thereof can be visually observed from the outside.
[0022]
On the other hand, the jet pipe 18 shown in FIG. 4 is a bentonite jet pipe, and is inclined so that the ceiling portion of the discharge pipe 18e having a rectangular cross-sectional opening is tapered toward the tip, and then parallel to the suction pipe 18d. However, it has the same configuration as the CMC jet pipe except for the point that it has a nozzle portion 18f extending to the CMC.
[0023]
Therefore, the powder material (bentonite, polymer material, dispersing agent) supplied into the charging pipe 18b is mixed while being disturbed by the jet water stream ejected through the suction pipe 18d and immediately dispersed uniformly. It will be thrown into the stirring tank 5 through the pipe 18e, will be put into the stirring tank 5 without forming a secondary agglomerate, and will be further mixed in the stirring tank 5.
[0024]
In addition, the stirring in the stirring tank 5 of each charged material is stirred by the stirring action of the jet water flow in the same manner as described above at the time of supplying fresh water, and after supplying the entire amount, as shown in FIGS. This is performed by a circulating stirring action by driving a slurry pump 21 disposed on the side of the stirring tank 5. This pump 21 acts as a product transfer pump when the operation for one batch is completed by valve switching described later, and is transferred to a stable liquid storage tank (not shown) disposed outside the plant 1 through a piping system.
[0025]
FIG. 5 shows a work flow of the stable liquid production plant 1 described above. In the same figure, the symbol M is a vibrator motor for opening and closing the gates of the storage tanks 10 to 12 and a motor for driving the screw conveyors 14 to 16, V1 to V4 are electromagnetic valves for pressure air mixing or circulation-discharge switching, FL1 to FL4 are float sensors, and the same parts as those described above are denoted by the same reference numerals. In addition, the broken line in the figure indicates a jet water flow piping system, and the solid line indicates fresh water or a material mixture or a stable liquid piping system as a product.
[0026]
The motor M and the valves V1 to V4 are sequentially driven and stopped by the control of the sequencer built in the control panel 7 in accordance with the load detection by the load cell 17 and the detection of the float sensors FL1 to FL4, and the manufacture is started. The process from the start to the end is either fully automatic or manually manufactured by an operator's selection operation. Further, as described above, the control panel 7 is provided with a touch panel display so that the operator can select the operation procedure, material input amount, and the like in an interactive manner while operating the display.
[0027]
6 and 7 show a flowchart of the operation procedure. Among these, FIG. 6 shows the steps from the start of operation to the addition of the material and fresh water, and FIG. 7 shows the steps from the subsequent circulation and stirring to the transfer to the stable liquid storage tank.
[0028]
First, in FIG. 6, when the control panel 7 is turned on, an initial screen is displayed on the display (see FIG. 8). According to the display, the operator touches the display location and selects whether it is automatic or manual. (Steps 1 to 3). If the operator selects automatic operation, input setting is performed by the operator according to this display (step 4). As shown in FIG. 8, the input items are the input amount of one batch of each material, the inverter frequency during feeder operation, the mixer set weight, the number of repeated batches, etc. The cursor is moved sequentially for each item. However, the setting is made by the input operation of the numeric keypad displayed on the display.
[0029]
When the execution key on the screen is pressed after the above operations are completed, the display screen on the display is switched to a screen similar to the flowchart of FIG. 5 as shown in FIG. Although this screen is basically the same, the part corresponding to the state is sequentially switched by blinking or numerical display as the driving situation changes.
[0030]
When the start button on this screen is pressed, the current weight and set value are written and calculated on the control panel 7 side by the built-in calculation function, and at the same time, the solenoid valve V1 is opened, the pump 20 is sequentially started, and each storage is performed. While the gates of the tanks 10 to 12 are opened, each motor M is driven to feed the material to the stirring tank 5 side (steps 5 to 9 above).
[0031]
In connection with this operation, on the control panel 7 side, the weight change of each storage tank 10-12 is compared with the calculated value. If the weight of the storage tank 5 satisfies the condition, the weight is calculated. At the same time, the gates of the storage tanks 10 to 12 are closed, then the electromagnetic valve V4 is opened, and the pump 20 connected to the stirring tank 5 side is started, so that fresh water is further added to the stirring tank 5 at the same time. Further, the inside of the tank is further stirred by the jetting effect of the jet water flow (steps 10 to 16 above).
[0032]
If an abnormality occurs in the above process, an emergency stop operation is automatically performed (step 12), the screen returns to the screen of (step 4) shown in FIG. 8, and the operator performs a resetting operation. Become.
[0033]
During the above operation, the material and fresh water are supplied into the agitation tank. During this period, it is always compared whether the weight in the agitation tank is equal to the set value, and is equal to the set value, that is, the set total weight is charged. At the completion stage, each pump 20 is stopped, and then the valves V1 and V4 are closed (steps 17 to 19).
[0034]
Thereafter, the operation continues at the steps shown in FIG. First, when the entire amount is charged into the agitation tank 5, after a predetermined time delay, the valve V2 is opened, the circulation in the agitation tank 5 is started, and then the pump 21 is started. The materials are circulated and mixed uniformly.
[0035]
At this stage, the water level in the stable liquid storage tank is confirmed. If OK, the valve V3 is opened and the valve V2 is closed after a predetermined time elapses by the timer process, and the circulation is completed at the same time as the transfer is started ( Steps 20 to 24).
[0036]
If the water level of the stable liquid storage tank is full, the circulation operation is only repeated, and the automatic operation is stopped after a predetermined time by the timer process.
[0037]
After completion of the circulation operation, it is constantly monitored whether the water level in the agitation tank 5 has become 0, and at the same time, it is also monitored whether the water level in the stable liquid storage tank is full (steps 25 and 26). When the tank 5 is empty, the pump 21 is stopped, the valve V3 is closed, the operation for one batch is completed (steps 27 to 30 above), and the number of batches in the display screen of FIG.
[0038]
Next, when the cumulative batch number reaches the set value in step 31, the automatic operation is terminated. On the other hand, if it does not reach the set value, the process returns to step 6 in FIG. 6 again, and the same operation thereafter is repeated.
[0039]
Further, during the transfer from the agitation tank 5 to the stable liquid storage tank, the inside of the stable liquid storage tank becomes full, that is, in the case of N in Step 26, the valve V2 is opened and the valve V3 is closed for transfer. The stop and recirculation mode is set (steps 32 and 33), the process returns to step 22, and the automatic operation is stopped through this step.
[0040]
In addition, in the above embodiment, even if the storage amount of each material in each of the storage tanks 10 to 12 is small and the blending ratio currently being manufactured is less than the setting, the load cell 17 detects the load ratio. The excess / deficiency is memorized, and at the next manufacturing, the excess / deficiency is subtracted and blended, and stored in the same stable liquid storage tank, so that the mixing ratio of the stable liquid in the stable liquid storage tank Will eventually be uniform.
[0041]
【The invention's effect】
As is clear from the above description, the stable liquid production plant according to the present invention is compact and closed because all devices necessary for the production of the stable liquid are packaged in one place in the frame. Since the system can perform the process from the input of the material to the mixing and dispersion, there is no need for manpower to transfer and input the powder material at the time of manufacture, labor can be saved, and there is no problem due to generation of dust.
[0042]
Furthermore, by introducing a control mechanism such as a sequencer, there is an advantage that everything from the material input to the mixing and dispersion and the transfer of the stable liquid storage tank can be performed fully automatically.
[Brief description of the drawings]
FIG. 1 is a front view of a stable liquid production plant according to the present invention.
FIG. 2A is a side view of the plant, and FIGS. 2B and 2C are plan views of the first and second floor portions of the plant.
FIG. 3 is a cross-sectional view and side views of a first jet pipe used for mixing.
FIG. 4 is a cross-sectional view and a side view of a second jet pipe used for mixing.
FIG. 5 is a flowchart of the plant.
FIG. 6 is a flowchart showing a control procedure during operation of the plant.
FIG. 7 is a flowchart showing a control procedure subsequent to FIG.
FIG. 8 is an explanatory diagram showing an initial screen of a touch panel attached to the plant.
FIG. 9 is an explanatory diagram showing a screen at the start of operation of the touch panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stabilizing liquid manufacturing plant 2 Frame frame 5 Stirrer tank 6 Fresh water tank 7 Control panel (control means)
9 Compressor 10 Bentonite storage tank 11 Polymer storage tank 12 Dispersant storage tanks 14 to 16 Screw conveyor (powder transportation means)
17 Load cell (load detection means)
18 Jet pipe (mixing and dispersing means)
20 Pump 21 Slurry pump V1-V4 switching means

Claims (4)

Place the sealed stirring vessel and the clean fluid tank of the lower floor portion of the frame frame, and arranging a plurality of reservoir housing a respective powder material constituting the stabilizing solution in the upper floor portion, the bottom of each reservoir ejection the manufacturing plant of a stable liquid which is connected to an upper portion of the stirring tank via the powder delivery means and mixing means connected to the outlet,
The mixing means communicates with the discharge port of each powder transporting means, and each is arranged on the upper surface of the agitation tank, and the powder material is mixed and dispersed in water by the turbulent flow effect of the jet water flow and put into the agitation tank A stable liquid production plant characterized by being a jet pipe . 2. The stable liquid production plant according to claim 1, wherein each of the storage tank and the agitation tank is suspended and supported in a frame frame via a load detection unit. Load setting means for each powder material constituting the stabilizing liquid, load detection means provided in the stirring tank and the storage tank for storing each powder material, and powder transport for supplying each powder material toward the stirring tank Means, mixing means for mixing and dispersing the supplied powder material in water and supplying it into the stirring tank, supplying fresh water into the stirring tank and stirring the inside of the stirring tank, and a set load, 3. The control unit according to claim 1, further comprising: a control unit that compares outputs from the load detection unit and stops supply of each supply unit when a value of the load detection unit matches a set load. Stable liquid production plant. When each powder material and fresh water are charged into the stirring tank, the mixture in the stirring tank is circulated, and is provided with pump means for transferring to the stable liquid storage tank side by switching the switching means. The manufacturing plant of the stable liquid according to claim 3 .

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